06 Komatsu GD825 Final Drive & Tandem [PDF]

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GD825A-2 Final Drives and Tandems



GD825A-2 Motor Grader.



Final Drive and Tandems Final Drive with Differential and Lock Up. Power is transmitted from the engine and transmission to the final drive Pinion & Crown wheel. The differential and differential lock are switched hydraulically by the contact between plate and disc



GD825A-2 Motor Grader



Final Drive and Tandems



DIFFERENTIAL LOCK INTERNAL TUBING DIFFERENTIAL LOCK VALVE



GD825A-2 Motor Grader



Final Drive and Tandems



Relief Valve “25 kg/cm2”



Diff solenoid



Final Drive with Differential Lock Diagram



Bearing Lubrication



GD825A-2 Motor Grader



Final Drive and Tandems Differential Lock Switch On to engage the differential lock. If Differential Lock is switch ON during high speed travel (F6 ~ F8) the controller will automatically cancel the differential lock



GD825A-2 Motor Grader



Final Drive and Tandems Differential Lock Pump



SBR (1) 10



Supplies oil to the differential lock piston when solenoid energised. Discharge amount at 2300 rpm 20 Liters/min.



GD825A-2 Motor Grader



Final Drive and Tandems



Final Drive with Diff lock. The solenoid valve controls the oil follow to the Differential Lock, an adjustable relief valve is installed onto this valve. GD825A-2 Motor Grader



Final Drive and Tandems



Tandem Drives The power from the final drives are transmitted to the front and rear sprockets by chain. The tandem case can swing up to 12 degrees up and 13 degrees down.



GD825A-2 Motor Grader



Final Drive and Tandems Tandem Geometry When both LH & RH wheels ride over an object (height: H) at the same time the centre of the rear axle rises H/2. Because the blade is mounted halfway between front and rear axles its movement further becomes H/4.



When only one side rides over an object the blade movement is H/8.



GD825A-2 Motor Grader